TY - JOUR ID - 10501 TI - Trend Analysis of Streamflows in East Azarbayjan Province JO - Irrigation Sciences and Engineering JA - JISE LA - en SN - 2588-5952 AU - Ghezel saflo, M. AU - Dinpashoh, Y. AU - Ghorbani, M.A. AU - Fakheri-Fard, A. AD - M.sc. Student, Department of Water Engineering, University of Tabriz, Tabriz, Iran AD - Associate Professor, Department of Water Engineering, University of Tabriz, Tabriz, Iran AD - Professor, Department of Water Engineering, University of Tabriz, Tabriz, Iran Y1 - 2012 PY - 2012 VL - 35 IS - 1 SP - 71 EP - 82 KW - Homogeneity KW - Sen KW - s estimator KW - Trend KW - Mann-kendal KW - Streamflow DO - N2 - The aim of this study is trend analysis of streamflows of eastAzarbayejan in three time scales, which are monthly, seasonal and annual usingthe non-parametric methods. For this purpose the information of discharges often hydrometric stations (1983 -2008) were used. The Mann-Kendal test was usedafter removing the all significant autocorrelation effects from the data. Inorder to estimate the slope of trend line the Sen,s estimator methodwas used.Results showed thatabout 30% of the stations showed statistically significant negative trends inannual time scale. The strongest negative trend line slope belonged to theVanyar station having the slope of 0.35 (m3/s/year) in annual timescale. In seasonal time scale, negative trends observed at almost all thestations. In monthly time scale streamflow trends were negative for most of thestations and none of the stations experienced positive significant trends (evenat 10% level). The strongest negative trend observed in Tazekand (Soofi-Chay),which was significant at 10% level. UR - https://jise.scu.ac.ir/article_10501.html L1 - https://jise.scu.ac.ir/article_10501_1d1077f30ba6d68a3c4631722dbdf982.pdf ER -